McMurry (kap.3,5)

Question 1

Does alkanes have high affinity for other substances?

(Affinity refers to the attraction or tendency of one substance to combine with another)

Answer 1

No, alkanes have low affinity.

Question 2

They occur in some chemical reactions, even though they are considered chemically inert most of the times.

What chemical reactions are those?

Answer 2

1. Alkanes reaction with oxygen (under forbrænding), carbon dioxide and water is formed.
2. Alkanes reaction with a halogen under ultraviolet light, leading to a mixture of halogenated products (ex. chlorinated product in use of Cl), anf HCl as product too.

Question 3

Does the boiling and melting point increase or decrease a long with the growth of the alkane size?

Answer 3

both the boiling and melting point increase along with the growth of the alkane (molecular weight increase).

Question 4

Does the increased branching in a alkane lower or rise the boiling and melting point?

Answer 4

It actually lowers the boiling and melting point.

-because of smaller surface area
-smaller dispersion forces (which means lower melting and boiling point).